Method for measuring polymer-base foam material elastic modulus by displacement sensor

A technology of displacement sensors and foam materials, applied in the direction of applying stable tension/pressure to test the strength of materials, measuring devices, and analyzing materials. It can solve the problems of small temperature range, large volume, and only one-time use. The effect of high accuracy and high sensitivity

Inactive Publication Date: 2006-05-31
TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI
View PDF0 Cites 15 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The extensometer generally equipped with the testing machine can also measure the strain of the material, but its volume is large and the applicable temperature range is small
[0003] Resistance strain gauges can also be used to measure the micro-strain of materials, but the strain gauges have a small range and can only be used once

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method for measuring polymer-base foam material elastic modulus by displacement sensor
  • Method for measuring polymer-base foam material elastic modulus by displacement sensor
  • Method for measuring polymer-base foam material elastic modulus by displacement sensor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Example 1: Measuring the compressive elastic modulus of a kind of PEI foam at room temperature:

[0025] The displacement sensor (the resistance value of the strain gauges R1, R2, R3 and R4 connected to the Wheatstone bridge circuit is 120), the fixture and the sample are assembled as image 3 Shown:

[0026] First, according to the measurement area of ​​the sample to be tested, a connecting piece 101 and 102 (fixture) perpendicular to the clamp arm 11 and the end of the clamp arm 22 are respectively fixedly connected, and then the connecting pieces 101 and 102 are respectively connected to the end of the clamp arm 22 to be measured. The two ends of the side wall of the measuring area of ​​the cylindrical polymer foam material are connected (such as image 3 Shown); the connecting wire of the Wheatstone bridge circuit in the displacement sensor is connected to an external strain gauge, which is connected to a computer (strain gauge and computer, not shown in the figure, and...

Embodiment 2

[0028] Example 2: Measuring the tensile elastic modulus of a kind of PEI foam plastic in liquid nitrogen temperature zone:

[0029] A connecting piece 101 and 102 perpendicular to the clamp arm 11 and the end of the clamp arm 22 of the displacement sensor are respectively fixedly connected, and then the connecting pieces 101 and 102 are connected to the side wall of the cylindrical polymer foam material A to be measured Connected in the middle (e.g. Figure 4 Shown); After assembling the displacement sensor, the displacement sensor fixture and the sample Figure 4 Shown: The connecting wire of the Wheatstone bridge circuit in the displacement sensor is connected to the external strain gauge, and the strain gauge is connected to the computer (strain gauge and computer, not shown in the figure, and the connection should be understood by those skilled in the art ). The tested foam material is dumbbell-shaped and has the same properties as the material used in Example 1. Using displacem...

Embodiment 3

[0031] Example 3, measuring the compressive elastic modulus of a kind of PEI foam plastic in liquid hydrogen temperature zone:

[0032] Displacement sensor, displacement sensor fixture and specimen are the same after assembly image 3 , Use liquid helium and temperature control equipment to achieve liquid hydrogen temperature (20K). The test materials are the same as the test materials of Examples 1 and 2. The compressive elastic modulus of the material liquid hydrogen temperature is shown in Table 3. The sample numbers in Table 3 represent four samples of the same material, and the average value of the compressive elastic modulus of the four samples is the compressive elastic modulus of the material (the standard deviation is 2.63).

[0033] Sample No

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

PropertyMeasurementUnit
electrical resistanceaaaaaaaaaa
densityaaaaaaaaaa
Login to view more

Abstract

A method for measuring elastic modulus of polymer based foam material by utilizing displacement transducer includes fixing measurement zone of said material to be measured on ends of said transducer two pincer arms then placing them into universal material tester, connecting leading wire of said transducer resistance foil gauge connected to be wheatstone bridge to strain gauge separately and connecting strain gauge to computer, exerting compression or tensile force on said material for obtaining stress ¿C strain data then sending it to computer for plotting out stress ¿C strain curve then obtaining said material property modulus as per the curve.

Description

Technical field [0001] The invention belongs to a measurement method for material performance testing in the technical field of Fangxue, and specifically relates to a method capable of measuring the elastic modulus of polymer-based foam materials with a displacement sensor in a wide temperature range (4.2K-300K). technical background [0002] Polymer-based foam materials have been widely used in packaging, cushioning and low-temperature insulation materials due to their high specific modulus, specific strength and excellent thermal insulation properties. This requires studying the tensile and compression mechanical properties of polymer-based foam materials. In actual operation, it is relatively easy to measure the tensile and compressive strength of polymer-based foams, but it is difficult to measure its elastic modulus. Because the elastic modulus test of a material is mainly to accurately measure the stress-strain (σ-ε) relationship of the material, and the key to the stress-s...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
Patent Type & Authority Applications(China)
IPC IPC(8): G01N3/08G01B7/16G01N19/00
Inventor 付绍云黄传军潘勤彦赵立中
Owner TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap